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LNAV LPV ILS Approach SmallAs Europe starts to roll out LNAV and LPV approach aids as part of their European Geostationary Navigation Overlay Service (EGNOS) we, in the search for news and updates, have found a Google Map showing those airports now operational or are planning to introduce such procedures to their landing aid portfolio.


So what are EGNOS, LNAV and LPV and why are they so important for aviation?


EGNOS, the European Geostationary Navigation Overlay Service, is the first pan-European satellite navigation system which augments the United States GPS navigation system. The EGNOS Open Service has been available to anyone with a GPS device equipped to receive EGNOS signals since October 2009 and officially declared available for aviation use in March 2011. It allows users in Europe to find their position to within 1.5 meters making it suitable for safety critical tasks found in aviation approach and landing requirements.

This system is Europe's entry into Global Navigation Satellite Systems (GNSS) and is a precursor to Galileo, the full global satellite navigation system currently under development.


LNAV LPV ILS Approach Medium


LNAV, Lateral Navigation, is the ability to navigate over a ground track using an electronic device that provides the pilot with a position derived from a GPS signal which is then displayed as an overlay on a moving map. It does not provide height information. When used as an approach aid the pilot can fly a GPS NPA, a non-precision step down approach similar in operation and minima to that of a VOR NDB approach.

LPV, Localizer Performance with Vertical guidance, provides the best instrument approach aid currently available without the need for specialised pilot training and has similar minima to the ILS approach procedure (200ft and 1/2 mile visibility). Even with its great precision, accurate to 12 meters in testing, LPV is still considered a non-precision approach aid. The Garmin GTN 7xx & 6xx, GNS 480, GNS 430W & 530W, and G1000 with GIA 63W all provide LPV capability.


The importance of GPS NPA and LPV is that they allow Instrument Rated and IR(restricted) pilots to perform a non-precision instrument approach using a suitably certified and equipped GPS receiver to any airfield with a published GPS NPA or LPV approach procedure. The great benefit of having this system is that any airfield with no investment in approach aids located at or near the airfield (ILS/NDB/VOR) can produce an GPS NPA and LPV approach procedure.

This will be a great safety benefit for General Aviation pilots who, when facing poor weather, would otherwise be required to fly to a suitably equiped airfield usually far from the desired airfield which has, for various reasons, led to many an aviation accident.


The European Satellite Services Provider (ESSP) are the official providers of EGNOS and when introduced the Galileo system. To find out more about the EGNOS Open and Safety of Life services see the video below or visit this website



ESSP have also produced a map of airfields that are operationally using LNAV/LPV and those airfields who are currently in the process of bringing the appraoch aid into service.


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